is SIP Termination?
The Session Initiation Protocol (SIP) is an
Engineering Task Force standard protocol for initiating
an interactive user session that could involve multiple
elements such as video, voice, and data.
Like other Internet protocols such as HTTP
SIP works in the application layer of the Open Systems
Interconnection communications model. This layer is
responsible for ensuring that communication is possible.
SIP can initiate multimedia sessions or Internet telephony
calls, and modify or terminate them. Because SIP supports
name mapping and redirection, it enables users to initiate
and receive data flow from any location, and for networks
to identify the users where ever they are.
SIP is a request-response protocol. That is, SIP manages
requests from clients and responses from servers. Participants
are identified by SIP URLs. Requests can be sent through
any transport protocol, such as UDP,
determines the end system to be used for the session,
the communication media and media parameters, and the
called party's desire to engage in the communication.
SIP then establishes call parameters at either end of
the communication, and handles call transfer and termination.
SIP presents an enormous opportunity to redefine how
networks communicate. SIP has proved to be such an outstanding
and flexible protocol that vendors and service providers
are spending significant resources to best leverage
this market opportunity. Some of the primary drivers
for SIP include:
- Interoperability of IP devices
- Easy deployment of multimedia applications through
seamless voice, video, and data integration
- Strong presence and instant messaging capabilities
- Tight device/application integration through SIP
support in Windows XP and AOL Instant Messenger
- 3G Mobile device support